Once a URL maps to a file, Apache 129 still decides what to send when nothing is there, what a bare directory returns, how the bytes are labeled and which handler produces them. ErrorDocument and the mod_mime and handler directives need the FileInfo override class (AllowOverride), mod_dir's directives need Indexes, and Options -Indexes needs Options=Indexes. The test site on port 8107 gains each class only when an example needs it.
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Errors, Indexes and MIME
Error Documents, Indexes, MIME Types and Handlers